Determination of Phase Transformation Temperatures of Titanium-Nickel Using Differential Thermal Analysis

摘要

Some of the more popular methods used to determine phase transformations in metals are x-ray, dilatometry, and electrical resistivity. Data reported for the TiNi alloy using Differential Thermal Analysis (DTA) is quite sparse and it appears that little effort has been made to correlate these results with x-ray, dilatometry, or resistivity data. The purpose of this investigation was to determine the Ms and As temperatures for several alloys having compositions near 50 atomic percent titanium. The DTA method was used. The results are compared with those reported by several investigators that used different techniques. The DTA data obtained shows excellent agreement with Kornilov's As temperatures, as a function of composition, obtained by dilatometry. A small variation was found between the results of this study and Wasilewski's x-ray data, and Hanlon's resistivity measurements for the Ms temperatures. It is concluded from this investigation that DTA analysis is a credible method for determining phase transformation temperatures for the TiNi material.